CN112024409A

CN112024409A - Full automatization part letter sorting equipment

Info

Publication number: CN112024409A
Application number: CN202010906099.7A
Authority: CN
Inventors: 朱振强; 黄金雄
Original assignee: Guangzhou Kinghing Construction Technology Co ltd
Current assignee: Guangzhou Kinghing Construction Technology Co ltd
Priority date: 2020-09-01
Filing date: 2020-09-01
Publication date: 2020-12-04

Abstract

The invention provides full-automatic part sorting equipment which comprises a main sorting device, a pin piece secondary sorting device, a K plate nut secondary sorting device and a tension wire nut secondary sorting device, wherein the main sorting device comprises a first vibrating disc and a first sorting mechanism, and the first sorting mechanism comprises a sorting main channel, a pin piece channel, a K plate nut channel, a K plate screw channel, a pin channel and a tension wire nut channel which are sequentially arranged along the sorting main channel and are respectively connected with the sorting main channel. The secondary sorting device for the pin pieces is located below the pin piece channel, the secondary sorting device for the K plate nuts is located below the K plate nut channel, and the secondary sorting device for the tension wire nuts is located below the tension wire nut channel. The invention can replace manual sorting, greatly improve the sorting efficiency and reduce the manpower consumption; and the risk of injury to the operating personnel during sorting is reduced.

Description

Full automatization part letter sorting equipment

Technical Field

The invention relates to the field of sorting devices, in particular to full-automatic part sorting equipment.

Background

The pin sheet, the K plate nut, the K plate screw, the pin and the tension wire nut belong to common metal accessories in engineering, are in an unordered mixed state after being subjected to logistics or recycled from an implementation site in the packaging and conveying processes, and are separated out by manual sorting in the prior art, so that a large amount of manpower is consumed, and the sorting efficiency is extremely low; sometimes, the metal fitting is pricked, which causes damage to the body of the worker.

In the prior art, a device for sorting metal parts is provided, and a specially designed channel is added on a first sorting mechanism aiming at the sorted parts to sort out corresponding metal parts; for example, chinese patent CN11123611A discloses a metal part sorting and arranging device; it can be used to sort screws and nuts, but it cannot be used to sort pin pieces, K-plate nuts, K-plate screws, pins, and tension wire nuts; the existing part sorting device cannot respectively count the sorted parts on a sorting pin sheet, a K plate nut, a K plate screw, a pin and a tension wire nut; at present, a complete set of automatic sorting device special for sorting pin pieces, K plate nuts, K plate screws, pins and tension wire nuts does not exist.

Disclosure of Invention

The invention provides full-automatic part sorting equipment for solving the problem that no full-set automatic sorting device specially used for sorting pin pieces, K plate nuts, K plate screws, pins and tension screw nuts exists at present in the background technology. The invention can be specially used for full-automatic sorting of the sorting pin sheet, the K plate nut, the K plate screw, the pin and the tension wire nut.

In order to solve the technical problems, the invention adopts the technical scheme that: the utility model provides a full automatization part letter sorting equipment, includes main sorting device, sells piece secondary sorting device, K board nut secondary sorting device and tension wire nut secondary sorting device, main sorting device includes first vibration dish and first sorting mechanism, be equipped with spiral shell screwing in and export and extend to in the first vibration dish outside first transfer passage, first sorting mechanism connects first transfer passage's export, first sorting mechanism includes the letter sorting main channel and along the letter sorting main channel set gradually and respectively with the round piece passageway, K board nut passageway, K board screw passageway, pin passageway and tension wire nut passageway that letter sorting main channel connects. The secondary pin piece sorting device is located below the pin piece channel, the secondary K plate nut sorting device is located below the K plate nut channel, and the secondary tension wire nut sorting device is located below the tension wire nut channel.

Further, the sorting main channel includes:

the main track is used for conveying pin pieces to be sorted, K plate nuts, K plate screws, pins and tension wire nuts;

the height limiting side plate is connected to the outer side edge of the head end of the main track and is provided with a first pin piece outlet, and the height of the first pin piece outlet is limited only by the passing of the pin piece;

the track is divided and used for screening out the tension wire nuts and conveying the tension wire nuts;

the guiding height-limiting surrounding rod is used for guiding the K plate screws and the pins;

the pin piece channel is connected outside the first pin piece outlet, the K plate nut channel is connected outside one end, close to the limiting side plate, of the guide height-limiting surrounding rod, the head end of the sub-track is connected to the main track, the tail end of the sub-track is connected to the tension wire nut channel, the pin channel is located at the tail end of the main track, the guide height-limiting surrounding rod is arranged above the main track and has a distance with the track surface of the main track, the distance is limited to the passage of the pin piece and the K plate nut, one end of the guide height-limiting surrounding rod is connected with the limiting side plate, the other end of the guide height-limiting surrounding rod extends to the pin channel, the main track is provided with a K plate screw opening which enables a K plate screw to fall and the pin not to fall between the pin channel and the K plate nut channel, and the K plate screw channel is located below the K plate screw opening, the tension wire nut channel is positioned at the other end of the sub-track.

Further, sell piece secondary sorting device and include second vibration dish and second sorting mechanism, the feed inlet of second vibration dish is just right sell the export of piece passageway, be equipped with spiral shell screwing in the second vibration dish and export and extend to the outside second transfer passage of second vibration dish, second sorting mechanism connects the export of second transfer passage, second sorting mechanism is including being used for becoming the curved surface track of perpendicular transport and selling the piece count export with the transport round piece of lying, sell piece count exit linkage in curved surface track's end, sell piece count exit and be equipped with first light sense counter.

Furthermore, the secondary sorting device for the K plate nuts comprises a third vibrating disk and a third sorting mechanism, a feed inlet of the third vibrating disk is over against an outlet of the K plate nut channel, a third conveying channel which is spirally raised and extends to the outside of the third vibrating disk is arranged in the third vibrating disk, the third sorting mechanism is connected with the outlet of the third conveying channel, the third sorting mechanism is arranged on the outer wall of the third vibrating disk in a surrounding manner, the third sorting mechanism comprises a current limiting track, a pin screening track and a K plate nut independent track which are sequentially connected along the conveying direction of the third sorting mechanism, and the current limiting track is an inner inclined plane which inclines inwards along the outer side of the third vibrating disk; the pin sheet screening track is an outer inclined plane which inclines outwards along the inner side of the third vibrating disk; the inner side edge of the current-limiting track is also provided with a barrier strip, the height of the barrier strip is 0.8-1.2 times of the thickness of the pin sheet, the inner side edge of the pin sheet screening track is flush with the inner side edge of the current-limiting track, and the outer side edge of the pin sheet screening track and the outer side edge of the current-limiting track have height difference; the utility model discloses a pin piece secondary sorting device, including round pin piece screening device, the orbital outside limit of round pin piece screening is equipped with side shield, the last round pin piece screening export of having seted up of side shield, round pin piece screening export is located round pin piece secondary sorting device's feed inlet top, the independent orbital end of K board nut is equipped with second light sense counter.

Further, the tensile wire nut secondary sorting device includes that fourth vibration dish and fourth divide and sort the mechanism, be equipped with spiral shell screwing in the fourth vibration dish and extend to fourth vibration dish outside fourth transfer passage, fourth divide the head end of sorting the mechanism to be connected fourth transfer passage's end, fourth divide the mechanism to include the letter sorting track, fourth divide to sort the mechanism and go up to follow the orbital direction of delivery of letter sorting is equipped with in proper order:

the displacement ladder is used for displacing the tension wire nut or the assembly for horizontal conveying into vertical conveying;

the height limiting rod is used for lifting the combination body with the height exceeding the height H of the single tension wire nut during vertical conveying to enable the combination body to become horizontal conveying;

and the posture screening port is used for enabling the tension wire nut which is conveyed in a lying mode to fall back to the inside of the fourth vibration disc, and the tension wire nut which is conveyed in a vertical mode cannot fall.

Furthermore, an inner side plate is arranged on one side of the sorting track, which is close to the outer wall of the fourth vibrating disk, and an outer side plate is arranged on the other side of the sorting track; the attitude screening port comprises a longitudinal notch formed in one end, close to the rail surface, of the inner side plate and a transverse notch extending from one end, close to the inner side plate, of the rail surface and corresponding to the longitudinal notch; the distance E between two opposite edges of the longitudinal notch and the transverse notch is larger than the radial width M of a single tension wire nut, the width B of the longitudinal notch is smaller than the height H of the single tension wire nut, the width C of the transverse notch is smaller than the radial width M of the single tension wire nut, and the lengths L of the longitudinal notch and the transverse notch are equal and are both larger than the height H of the single tension wire nut.

Furthermore, the main track comprises a front end track, a middle track and a rear end track which are sequentially connected end to end, the pin sheet channel and the K plate nut channel are connected to the front end track, and the width of the middle track is less than 1.5 times of that of the tension wire nut; the K plate screw channel and the pin channel are positioned below the rear end track; the rear end track and the branch track are arranged adjacently and are connected to the same end of the middle track together, and the distance between the side edge of the rear end track adjacent to the branch track and the guide height-limiting surrounding rod is smaller than 1/2 of the width of the tension wire nut.

Furthermore, the main track and the branch track are both arc-shaped, and the main track is in a downward slope along the pin sheet channel, the K plate nut channel, the K plate screw channel and the tension wire nut channel.

Further, the K plate nut channel include with the passageway bottom plate of main track parallel and level, one side of passageway bottom plate is connected on the main track, the passageway bottom plate with one side that the main track is relative is equipped with the side shield, the export of second round pin piece has still been seted up on the side shield.

Further, direction limit for height surrounding rod is in the corresponding position of K board screw opening part is equipped with the breach or the portion of encircleing that supplies the K board screw to drop, breach or the portion of encircleing with K board screw open-ended first side piece is just right from top to bottom, on the K board screw opening with the relative second side piece of first side piece is located the outside of primary rail, first side piece with interval D between the second side piece satisfies: the length of the K plate screw is less than the length of the pin and less than the length of the pin.

Compared with the prior art, the beneficial effects are:

1. according to the invention, the whole equipment carries out primary sorting and secondary sorting according to the respective structural characteristics of the pin sheet, the K plate nut, the K plate screw, the pin and the tension wire nut; during primary sorting, the main sorting device can sequentially sort out pin pieces, K plate nuts, K plate screws, pins and tension wire nuts by virtue of the ingenious design of structures such as sorting openings, main rails, sub rails, guide height limiting surrounding rods and the like on a sorting main channel on the main sorting mechanism and under the action of the first vibrating disc; manual sorting can be replaced, the sorting efficiency is greatly improved, and the manpower consumption is reduced; and the risk of injury to the operating personnel during sorting is reduced.

2. In the invention, each secondary sorting device is added in consideration of confusion during primary sorting to perform secondary sorting, so that sorted small iron pieces are purer; primary sorting device and secondary sorting device only need not other auxiliary assembly through simple structural design, just can accomplish more accurate letter sorting.

3. According to the tension wire nut secondary sorting device, according to the structural characteristics of the tension wire nut and the combined body, the large batch of tension wire nuts and pins can be automatically secondarily sorted by virtue of the ingenious design of the deflection ladder, the height limiting rod and the posture screening opening in the sorting mechanism and the conveying action of the vibration disc, so that the labor can be greatly saved, and the sorting efficiency can be improved; and simple structure, convenient to use.

4. According to the secondary sorting device for the K plate nuts, the structural characteristics of the pin pieces and the K plate nuts are matched through the ingenious structural design of the flow limiting section and the pin piece screening section, so that the pin pieces and the K plate nuts can only pass through one piece, and the pin pieces can be prevented from being stacked and cannot be sorted out; when the sorting is carried out, the pin pieces mixed in the K plate nut material can be more accurately screened out; and the sorted K plate nuts can be counted and collected.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a schematic view of the construction of one side of the pin channel of the present invention.

Fig. 3 is a schematic view of the structure of the main sorting passage in the present invention.

Fig. 4 is a schematic structural view of the first sorting mechanism of the present invention.

FIG. 5 is a schematic view of the pin plate channel and K-plate nut channel of the present invention.

FIG. 6 is a schematic view of the structure of the screw opening of the K plate of the present invention.

Fig. 7 is a schematic structural view of the secondary pin sorting apparatus of the present invention.

Fig. 8 is a schematic structural view of the second sorting mechanism in the present invention.

Fig. 9 is a schematic structural diagram of a secondary sorting device for K-plate nuts in the invention.

Fig. 10 is a schematic view of the structure of the current-limiting rail and the position where the pin sheet is screened out of the rail in the present invention.

Fig. 11 is a schematic structural view of the tension wire nut secondary sorting device in the invention.

Fig. 12 is a schematic structural view of the attitude sifting port in the present invention.

FIG. 13 is a schematic view of an attitude screening port of the present invention in use.

Fig. 14 is a schematic structural view of the tension wire nut of the present invention.

Detailed Description

The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.

The utility model provides a full automatization part letter sorting equipment, including main sorting device 100, sell piece secondary sorting device 200, K board nut secondary sorting device 300 and tension wire nut secondary sorting device 400, main sorting device 100 includes first vibration dish 1001 and first sorting mechanism 110, be equipped with spiral rising and export in the first vibration dish 1001 and extend to the outside first transfer passage 111 of first vibration dish 1001, first sorting mechanism 110 connects the export of first transfer passage 111, first sorting mechanism 110 includes letter sorting main channel 1 and sets gradually and the round pin piece passageway 2 of being connected with letter sorting main channel 1 respectively along letter sorting main channel 1, K board nut passageway 3, K board screw passageway 4, pin passageway 5 and tension wire nut passageway 6. The secondary pin sorting device 200 is located below the pin channel 2, the secondary K-plate nut sorting device 300 is located below the K-plate nut channel 3, and the secondary tension wire nut sorting device 400 is located below the tension wire nut channel 6.

In the main sorting device 100, the sorting main shaft 1 includes:

the main track 10 is used for conveying a pin sheet 20 to be sorted, a K plate nut 30, a K plate screw 40, a pin 50 and a tension wire nut 60;

a height-limiting side plate 104 connected to an outer side of the head end of the main rail 10 and provided with a first pin plate outlet 201 whose height is limited to pass through the pin plate 20;

the sub-track 20 is used for screening out the tension wire nuts 60 and conveying the tension wire nuts;

a guide height-limiting surrounding rod 105 for guiding the K plate screw 40 and the pin 50;

the pin sheet channel 2 is connected outside the first pin sheet outlet 201, the K plate nut channel 3 is connected to the outer side of one end, close to the height-limiting side plate 104, of the guide height-limiting surrounding rod 105, the head end of the sub-rail 20 is connected to the main rail 10, the tail end of the sub-rail is connected with the tension wire nut channel 6, the pin channel 5 is located at the tail end of the main rail 10, the guide height-limiting surrounding rod 105 is arranged above the main rail 10 and has a distance with the rail surface of the main rail 10, the distance is only limited to the pin sheet 20 and the K plate nut, one end of the guide height-limiting surrounding rod 105 is connected with the height-limiting side plate 104, the other end of the guide height-limiting surrounding rod 105 extends to the pin channel 5, and; the main rail 10 is provided with a K plate screw opening 44 between the pin channel 5 and the K plate nut channel 3, the K plate screw opening 44 enables the K plate screw 40 to fall and the pin 50 not to fall, the K plate screw channel 4 is positioned below the K plate screw opening 44, and the tension wire nut channel 6 is positioned at the other end of the sub rail 20; the K plate nut channel 3 comprises a channel bottom plate which is flush with the main rail 10, one side of the channel bottom plate is connected to the main rail 10, a side baffle 301 is arranged on one side, opposite to the main rail 10, of the channel bottom plate, and a second pin piece outlet 302 is further formed in the side baffle 301.

In this embodiment, the main rail 10 includes a front end rail 101, a middle rail 102 and a rear end rail 103 which are sequentially connected end to end, the pin sheet channel 2 and the K plate nut channel 3 are connected on the front end rail 101, and the width of the middle rail 102 is less than 1.5 times of the width of the tension wire nut 60; the K plate screw channel 4 and the pin channel 5 are positioned below the rear end rail 103; the rear end rail 103 and the sub-rail 20 are adjacently arranged and are connected to the same end of the middle rail 102 together, and the distances between the adjacent side edges of the rear end rail 103 and the sub-rail 20 and the guide height-limiting surrounding rod 105 are smaller than 1/2 of the width of the tension wire nut 60; the main track 10 is constantly sloped downward along the pin plate channel 2, the K plate nut channel 3, the K plate screw channel 4, and the tension wire nut channel 6.

The direction limit for height rail 105 is equipped with breach 41 or the portion of encircleing that supplies K board screw 40 to drop in the corresponding position of K board screw opening 44 department, and breach 41 or the portion of encircleing are just right from top to bottom with K board screw opening 44's first side piece 42, and the second side piece 43 relative with first side piece 42 is located the outside of primary rail 10 on K board screw opening 44, and interval D between first side piece 42 and the second side piece 43 satisfies: the length of the K plate screw 40 < D < the length of the pin 50.

The sub-rail 20 is inclined downwards from one side close to the rear end rail 103 to the other side; the main track 10 and the sub-track 20 are both arc-shaped; the guide height-limiting shroud 105 is made of an aluminum alloy. Because the main track 10 and the sub-track 20 are both arc-shaped and can be arranged around the outer side wall of the vibration disc 1001, the layout space is saved, the track surface of the sub-track 20 is a downward downhill from outside to inside, and is a reverse slope relative to the rear end track 103, so that the tension wire nut 60 can be conveniently shunted.

First, the main sorting device 100 first sorts the pin pieces 20, the K-plate nuts 30, the K-plate screws 40, the pins 50, and the tension wire nuts 60 at one time (or other parts each having a similar structure). When the material mixing device is used, the first vibration disc 1001 is internally provided with the disordered pin sheet 20, the K plate nut 30, the K plate screw 40, the pin 50 and the tension wire nut 60 (which are subsequently called mixed materials) for sorting, and the first vibration disc 1001 can convey the mixed materials out in sequence in the first conveying channel 111 through exciting force, which belongs to the existing common technology and is not described in detail herein; when the mixed material is conveyed out from the outlet of the first conveying channel 111 and then enters the main sorting mechanism 110 and enters the main sorting channel 1, the mixed material can continuously move along the main channel due to the action of exciting force and self gravity, the front end of the main sorting channel 1 is provided with a height-limited side plate 104, the mixed material firstly reaches the pin sheet channel 2, the height-limited side plate 104 is provided with a first pin sheet outlet 201 with the height slightly larger than the thickness of the pin sheet 20, the height of the first pin sheet outlet 201 is larger than the thickness of the pin sheet 20 and smaller than the thickness of the K plate nut 30, so that the pin sheet 20 can be screened and passed, the K plate nut 30 and other materials can not pass through the first pin sheet outlet 201, and the pin sheet 20 falls into the pin sheet secondary sorting device 200 after sliding out from the first pin sheet outlet 201; the remaining 4 mixed materials (the K plate nut 30, the K plate screw 40, the pin 50 and the tension screw nut 60) are continuously conveyed to the K plate nut channel 3, the height of the main track 10 in the K plate nut channel 3 is limited by a guide height limiting surrounding rod 105, the height of the guide height limiting surrounding rod 105 and the track surface of the main track 10 is larger than the thickness of the K plate nut 30, is smaller than the width of a nut cap on the K plate screw 40 and the pin 50 and is also much smaller than the width of the tension screw nut 60 (the tension screw nut 60 is in a regular hexagonal prism shape, the width of the tension screw nut 60 in the embodiment refers to the length of two opposite point diagonals on the bottom surface of the tension screw nut 60), the guide height limiting surrounding rod 105 is arranged along the main track 10 and also plays a conveying guide function, when the K plate nut 30 passes through the front end of the guide height limiting surrounding rod 105, the K plate nut is screened out and conveyed to the channel bottom plate of the K plate nut channel 3, and the pin pieces 20 which are not output in time at the, then falls out of the second pin outlet 302, the height of the second pin outlet 302 is consistent with that of the first pin outlet 201, and the pin 20 falls into the pin secondary sorting device 200 after sliding out of the second pin outlet 302; the K-plate nut channel 3 falls out from the side of the channel bottom plate adjacent to the second pin outlet 302, and the K-plate nut slides down from the K-plate nut channel 3 and then falls into the K-plate nut secondary sorting device 300 (wherein a small number of pin pieces which do not fall out from the second pin outlet in time due to stacking are also mixed); the rest K plate screws 40, the pins 50 and the tension wire nuts 60 are conveyed continuously, because the diameters of the rod ends of the K plate screws 40 and the pins 50 are smaller than the distance from the guide height limiting surrounding rod 105 to the main track 10, and the diameters of the cap ends of the K plate screws 40 and the pins 50 are larger than the distance from the guide height limiting surrounding rod 105 to the main track 10, when the K plate screws 40 and the pins 50 enter the guide section of the guide height limiting surrounding rod 105, the K plate screws 40 and the pins 50 are conveyed in a posture that the rod ends can extend out of the guide height limiting surrounding rod 105 and the cap ends are hung by the guide height limiting surrounding rod 105 under the action of gravity and excitation force, and when the K plate screws 40 and the pins 50 reach the middle track 102 of the main track 10, the middle track 102 plays a role in limiting width and current; because the width is only slightly larger than that of the tension wire nut 60, only one tension wire nut 60 can be accommodated to pass through at a time, the K plate screws 40 and the pins 50 are sequentially conveyed to pass through one by one, and a falling hole exists between the middle rail 102 and the side wall of the first vibration disc 1001, so that the excessive K plate screws 40, the pins 50 and the tension wire nut 60 can fall back into the first vibration disc 1001; after the flow limitation of the middle rail 102, 3 materials are shunted under the guiding action of the guiding height-limiting surrounding rod 105, the middle rail 102 is connected with the rear end rail 103 and the branch rail 20 at the same time, the rear end rail 103 and the branch rail 20 are arranged in a close and parallel manner, the tension wire nut 60 is conveyed along the branch rail 20 after being shunted and finally falls into the tension wire nut channel 6 due to the fact that the tension wire nut 60 is large in size and the extrusion action of the guiding height-limiting surrounding rod 105 can extrude all the materials to the branch rail 20, a reverse slope is formed between the branch rail 20 and the rear end rail 103, the tension wire nut 60 is convenient to shunt, and some pins 50 are inserted into the tension wire nut 60 and then enter the tension wire nut channel 6 and finally fall into the tension wire nut secondary sorting device 400 to sort out the mixed pins 50; and the shape of the K-plate screw 40 is similar to that of the pin 50, except that the rod of the K-plate screw 40 is shorter and the diameter of the cap end is smaller, the K-plate screw 40 and the pin 50 continue to be hung on the guiding height-limiting surrounding rod 105 to move along the rear-end track 103, when they reach the K-plate screw opening 44, the K-plate screw opening 44 is an opening arranged on the track surface of the rear-end track 103, and the distance D between the first side block 42 and the second side block 43 on the K-plate screw opening 44 satisfies: the length of the K plate screw 40 < D < the length of the pin 50, the guiding height-limiting surrounding rod 105 is positioned above the first side edge block 42, so that the K plate screw 40 and the cap end of the pin 50 can be supported by the first side edge block 42, but the pin 50 can straddle the K plate screw opening 44 to be supported and move continuously due to the longer pin 50; the K plate screw 40 is short, the tail end of the rod cannot be supported and falls off, and the cap end of the rod is tilted when the tail end of the rod falls off, so that the guide height-limiting surrounding rod 105 is provided with a notch 41 or an arched part at a corresponding position, if the notch 41 is provided, the distance between the notches 41 is larger than the width of the cap end of the K plate screw 40 and can also be slightly larger than the width of the cap end of the pin 50, because both ends of the pin 50 are supported, the pin can stably move along the track, and the pin cannot fall off as long as the notch 41 is not too large; it should be particularly noted that, when the first vibration plate 1001 is mounted and connected, the guiding height-limiting surrounding rod 105 is also hung on the side wall of the first vibration plate 1001 through an external connecting bridge (not shown in the drawings, or other structures can be used, which plays a connecting role and does not affect the function of the guiding height-limiting surrounding rod 105), so that even if the gap 41 exists in the middle section, the rear end is not completely suspended; if the screw is arched, the arched dimension is larger than the size of the cap end of the K plate screw 40 and can be slightly larger than the size of the cap end of the pin 50, so that the K plate screw 40 is provided with a falling space and cannot be hung by the guide height limiting surrounding rod 105; after screening at the K plate screw opening 44, only the remaining pins 50 are hung on the guide height-limiting surrounding rod 105 to be conveyed continuously, and finally fall into the pin channel 5 at the tail end of the rear-end track 103; because K board screw and pin are difficult to obscure when actually sorting, so do not need the secondary letter sorting, so can directly respectively install the light sense counter in K board screw opening and pin exit, count the K board screw opening or the pin of sorting out.

After primary sorting by the primary sorting device 100, secondary sorting is performed respectively, and a pin sheet, a K-plate nut and a tension wire nut are required for secondary sorting. Wherein:

secondary sorting of the pin pieces: since the sorted pin pieces are easily stacked and are not counted well, the secondary sorting of the pin pieces is performed in the pin piece secondary sorting apparatus 200, the pin piece secondary sorting apparatus 200 includes a second vibratory tray 210 and a second sorting mechanism 212, a feed port of the second vibratory tray 210 faces an outlet of the pin piece passage 2, a second conveying passage 211 spirally rising and having an outlet extending to the outside of the second vibratory tray 210 is provided in the second vibratory tray 210, the second sorting mechanism 212 is connected to an outlet of the second conveying passage 211, the second sorting mechanism 212 includes a curved surface track 213 for changing the horizontally-lying conveying pin pieces into vertical conveying and a pin piece counting outlet 214, the pin piece counting outlet 214 is connected to an end of the curved surface track 213, an inner side of the curved surface track 213 is provided with a circular bar for supporting only one pin piece 20, a height of the circular bar is 0.8 times a thickness of the pin piece, so that when 2 pin pieces 20 are stacked, an upper pin piece 20 falls back from the circular bar into the second vibratory tray 210, only one pin can be allowed to be delivered after another; a first light-sensitive counter (not shown) is disposed at the pin counting outlet 214; the stacked pin pieces pass through the curved surface track 213, and the pin pieces stacked on the other pin pieces fall back to the inner cavity of the second vibration plate 210 due to the self-gravity; so that the curved track 213 of the second sorting mechanism 212 can only allow one pin to pass through at a time, and finally, the pin count outlet 214 can be used for accurate counting.

And (3) secondary sorting of K plate nuts: since a small amount of pins are mixed in the K-plate nut material sorted out at one time, the K-plate nut secondary sorting device 300 needs to perform secondary sorting of K-plate nuts, the K-plate nut secondary sorting device 300 comprises a third vibration disc 500 and a third sorting mechanism 502, a feed inlet of the third vibration disc 500 is over against an outlet of a K-plate nut channel, a third conveying channel 501 which is spirally raised and an outlet 513 of which extends to the outside of the third vibration disc 500 is arranged in the third vibration disc 500, the third sorting mechanism 502 is connected with the outlet 513 of the third conveying channel 501, the third sorting mechanism 502 is arranged on the outer wall of the third vibration disc 500 in a surrounding manner, the third sorting mechanism 502 comprises a flow limiting track 503 which is sequentially connected along the conveying direction of the third sorting mechanism 502, the pin sheet screening track 504 and the K-plate nut independent track 505, and the current limiting track 503 is an inner inclined surface inclined inward along the outer side of the third vibration disk 500; the pin sifting track 504 is an outer slope inclined outward along the inner side of the third vibratory pan 500; a baffle 509 is further arranged on the inner side edge of the current limiting rail 503, the height of the baffle 509 is 0.9 times (can be between 0.8 and 1.2 times) of the thickness of the pin piece, the inner side edge of the pin piece screening rail 504 is flush with the inner side edge of the current limiting rail 503, and the outer side edge of the pin piece screening rail 504 and the outer side edge of the current limiting rail 503 have height difference; a side baffle 506 is arranged on the outer side edge of the pin screening track 504, a pin screening outlet 507 is formed in the side baffle 506, the pin screening outlet 507 is located above a feed inlet of the pin secondary sorting device 200, and a second light sensing counter (not shown in the figure) is arranged at an outlet 508 of the K plate nut independent track 505.

The inner and outer sides in the present embodiment are based on the inner and outer sides of the circular third vibratory pan 500; during actual sorting, the materials to be sorted (the mixture of the pin pieces 20 and the K-plate nuts 30) are firstly collected in the inner cavity of the third vibration disk 500, and are subjected to the action of the vibration force of the third vibration disk 500, so that the materials to be sorted are conveyed out along the third conveying channel 501 and reach the external third sorting mechanism 502; the conveyed K plate nuts 30 and the pin pieces 20 are stacked together and are squeezed into a pile, so that the subsequent sorting is not facilitated; so that the materials are firstly shunted through the current-limiting rail 503, so that the materials pass one by one but cannot pass side by side or in a stack; specifically, due to the effect of the spiral inner slope on the current limiting track 503, the material can only move against the inner barrier 509, and the height of the barrier 509 is limited to support only one K-plate nut 30 or one pin 20; more than 2 stacked together will fall from above and fall back into the third vibratory pan 500 for re-transport; after the flow limitation, due to the action of the barrier 509, the materials to be sorted enter the pin sieving track 504 one by one, and since the inner side edge of the outer inclined track surface is level with the inner side edge of the spiral inner inclined surface, the outer side edge of the outer inclined track surface has a height difference with the outer side edge of the spiral inner inclined surface, and the top end of the side baffle 506 is level with the outer side edge of the spiral inner inclined surface; the pin sifts out where the head end of the track 504 meets the restrictor track 503 to have a triangular shaped abutment surface 512. Due to the action of the outer inclined surface, materials entering the pin piece screening track 504 can all run against the side plate, and the pin piece screening outlet 507 arranged at the bottom end of the side baffle 506 can enable the pin piece 20 to be screened out; the height of the K plate nut 30 is greater than the opening height of the pin piece screening outlet 507, the K plate nut continues to move forwards and then enters the inlet of the K plate nut independent track 505; the K plate nut independent track 505 runs to an outlet 508 of the K plate nut independent track 505, and the K plate nut independent track passes through the outlet 508, is counted by a second light-sensitive counter, and finally falls into a collecting hopper.

The secondary sorting device 300 for the K-plate nuts in the embodiment matches the structural characteristics of the pin pieces 20 and the K-plate nuts 30 through the ingenious structural design of the current limiting section and the screening section of the pin pieces 20, so that the pin pieces 20 and the K-plate nuts 30 can only pass through one by one, and the pin pieces 20 can be prevented from being stacked and cannot be sorted out; when sorting is carried out, the pin pieces 20 mixed in the materials of the K plate nuts 30 can be screened out more accurately; and can count and collect the sorted K-plate nuts 30.

Secondary sorting of tension wire nuts: because a small amount of pins can be mixed in the tension wire nut material after once sorting, so need carry out secondary sorting to the tension wire nut in tension wire nut secondary sorting device 400, tension wire nut secondary sorting device 400 includes vibration dish 401 and letter sorting mechanism 402, be equipped with spiral shell screwing in the vibration dish 401 and extend to the outside transfer passage 403 of vibration dish 401, the end 417 at transfer passage 403 is connected to letter sorting mechanism 402 head end, letter sorting mechanism 402 includes letter sorting track 404, letter sorting mechanism 402 is gone up and is equipped with in proper order along letter sorting track 404's direction of delivery:

a deflection ladder 405 for deflecting the tension wire nut or assembly 408 for horizontal conveying into vertical conveying;

a height limiting rod 406 for lifting the assembly 408 with the height exceeding the height H of a single tension wire nut during vertical conveying to enable the assembly to become horizontal conveying;

the posture screening port 407 is used for enabling the tension wire nut 410 which is conveyed in a lying mode to fall back to the interior of the vibration disc 401, and the tension wire nut 60 which is conveyed in a standing mode cannot fall.

An inner side plate 414 is arranged on one side of the sorting track 404 close to the outer wall of the vibrating disk 401, and an outer side plate 415 is arranged on the other side (for convenience of display, one section is omitted in the figure); as shown in fig. 2 and 3, the posture screening port 407 includes a longitudinal notch 418 formed at one end of the inner plate 414 close to the rail surface, and a transverse notch 419 formed at one end of the rail surface close to the inner plate 414 and extending corresponding to the longitudinal notch 418; the distance E between the opposite edges of the longitudinal notch 418 and the transverse notch 419 is greater than the radial width M of the single nut 60, the width B of the longitudinal notch 418 is less than the height H of the single nut 60, the width C of the transverse notch 419 is less than the radial width M of the single nut 60 (as shown in fig. 4, the radial width M is the length of the hexagonal opposite points of the bottom surface of the nut 60 connected as a diagonal), and the length L of the longitudinal notch 418 and the transverse notch 419 are equal to each other and are greater than the height H of the single nut 60. The posture screening opening 407 is an integral body, and is divided into a longitudinal notch 418 and a transverse notch 419 for better distinction, and the longitudinal notch 418 and the transverse notch 419 are annular on an arc surface, are basically rectangular when unfolded, and can also be designed into other shapes meeting the function.

Wherein, the height drop D of the displacement step 405 satisfies D ═ H; one end of the height limiting rod 406 is fixed on the inner side plate 414, the height limiting rod 406 is arranged right above the sorting track 404, and the distance A between the height limiting rod 406 and the sorting track 404 is H. The height drop D of the displacement step 405 cannot be too high, if too high, the speed of the tension wire nut 60 falling onto the sorting track 404 is too high to be stable, and if too low, the tension wire nut 60 cannot be displaced, generally set to H-H, and the effect is better at H.

In this embodiment, the sorting track 404 is sloped downward in its conveying direction; a discharging hopper is arranged below the tail end 416 of the sorting mechanism 402; sorting mechanism 402 is made of a metal material; the sorting track 404 is in a circular arc shape matched with the vibration disc 401, the inner side plate 414 is attached to the outer wall of the vibration disc 401, the posture screening port 407 is communicated with the inner cavity of the vibration disc 401 through a falling channel, and the falling channel penetrates through the outer wall of the vibration disc 401 at a position corresponding to the posture screening port 407.

The sorting track 404 comprises, arranged in succession: a docking section 411 that docks with an end 417 of the transport channel 403;

a flow limiting section 412 for passing the tension wire nuts 60 to be sorted one by one;

the sorting section 413, the deflection ladder 405, the height limiting rod 406 and the attitude screening opening 407 are sequentially arranged along the conveying direction of the sorting section 413. A conveying channel 403 in the vibrating disk 401 conveys the materials to be sorted to a pair stage, and the materials enter a sorting mechanism 402 for sorting; the flow restrictor 412 is abruptly narrowed relative to the butt end rail width to allow only one tension wire nut 60 to pass through at a time, preventing the tension wire nuts 60 from stacking close together and interfering with each other and even causing jamming.

Before sorting, a plurality of tension wire nuts 60 to be sorted are placed in the vibration disc 401, wherein pins 50 are inserted into the vibration disc, the combination 408 is called, rod sections of the pins 50 are inserted into the tension wire nuts 60, and cap ends are exposed, so that the combination 408 is higher than the height H of a single tension wire nut 60, and the pins 50 and the tension wire nuts 60 are movably inserted and can be easily loosened under external force.

When sorting is started, the vibration disc 401 is started, and the vibration mechanism on the vibration disc 401 enables the material to spirally ascend along the conveying channel 403 through exciting force, which belongs to the prior art and is not described in detail. When the pulling wire nuts 60 are conveyed to the tail end 417 of the conveying track and enter the sorting mechanism 402, the sorting mechanism 402 can also be subjected to the exciting force of the vibrating mechanism, so that the pulling wire nuts 60 are continuously conveyed along the sorting track 404, the sorting track 404 is in a downhill shape, and the pulling wire nuts 60 can move faster under the self-gravity; after the tension wire nut 60 or the assembly 408 reaches the flow-limiting section 412 through the docking section 411, only one tension wire nut 60 or assembly 408 can pass through each time, and most of the tension wire nut 60 or the assembly 408 is conveyed in a lying posture, namely lying conveying; the following three situations may then exist:

the first method comprises the following steps: for a single tension wire nut 60, firstly, the tension wire nut is conveyed horizontally to reach a displacement step 405, and a height drop D exists during displacement and grounding, so that the tension wire nut 60 falls down and stands up to become vertical conveying; then, the tension wire nut passes through the height limiting rod 406, because the tension wire nut 60 is a single tension wire nut 60, the height of the height limiting rod is lower than the height A of the height limiting rod 406, so that the height limiting rod 406 does not act on the tension wire nut 60, then the tension wire nut passes through the attitude screening port 407, the attitude screening port 407 is in a right-angled plane shape, the height B of the longitudinal plane is lower than the height H of the tension wire nut 60, the radial width M of the tension wire nut 60 on the transverse plane is smaller than the width C of the arm tension wire nut 60, so that the erected tension wire nut 60 cannot fall down from the attitude screening port 407, and is conveyed to the tail end 416 of the sorting mechanism along the sorting track 404 and finally falls into a discharging hopper for collection; a light-sensitive counter is also typically provided at the end 416 of the sorter mechanism to count the collected tension wire nuts.

And the second method comprises the following steps: in the first case, assuming that the single tension wire nut 60 is not accidentally changed into a vertical type conveyance at the shift step 405, and continues to travel along the sorting track 404 in a lying conveyance, it may fall from the attitude sifting port 407 when it reaches the attitude sifting port 407, and as shown in fig. 1 and 3, the lying tension wire nut 410 falls from the attitude sifting port 407; because the width of the inclined plane of the right-angle plane-shaped attitude screening opening 407 is greater than the radial width M of the tension wire nut 60, and the length is also greater than the length of the combined body 408; therefore, the pulling wire nut 60 conveyed in a lying state can fall back to the inner cavity of the vibration disc 401 along the falling channel after falling; waiting for the next sorting and screening.

Thirdly, when the combined body 408 reaches the position of the displacement step 405, the non-cap end faces downwards and generally stands up to be changed into vertical conveying; but then it reaches the height-limiting stem 406, which is greater than H since the height of the combination 408 is generally above H; therefore, the height limiting rod 406 acts on the height limiting rod to lift the height limiting rod to be conveyed in a lying state, the pin 50 is generally separated when the height limiting rod is lifted, and then the pin independently falls from the posture screening port 407, and the tension wire nut 410 which is lifted to lie in a lying state also falls from the posture screening port 407; it is also possible that the assembly 408, lying flat, may continue to be transported to the attitude sifting port 407, and, as a result of lying flat, may also fall from the attitude sifting port 407, and may fall off due to a large impact during falling from the falling channel into the inner cavity of the vibratory pan 401; when the tension wire nut 60 runs to the conveying channel 403 for the second time, the tension wire nut 60 is conveyed independently, the individual pins 50 finally fall back into the inner cavity of the vibration disc 401 from the attitude screening opening 407, and the tension wire nuts are finally conveyed vertically and collected in a blanking hopper.

According to the structural characteristics of the tension wire nut 60 and the combined body 408, the tension wire nut secondary sorting device 400 can automatically perform secondary sorting on a large batch of tension wire nuts and pins by the ingenious design of the displacement ladder 405, the height limiting rod 406 and the posture screening port 407 in the sorting mechanism 402 and the conveying action of the vibration disc 401, so that the labor can be greatly saved, and the sorting efficiency can be improved; and simple structure, convenient to use.

According to the structural characteristics of the pin sheet 20, the K plate nut 30, the K plate screw 40, the pin 50 and the tension wire nut 60, the whole device of the embodiment performs primary sorting and secondary sorting; during primary sorting, the main sorting device 100 can sequentially sort out the pin pieces 20, the K plate nuts 30, the K plate screws 40, the pins 50 and the tension wire nuts 60 by skillful design of structures such as sorting ports, main rails 10, sub rails 20, guide height limiting surrounding rods 105 and the like on a sorting main channel 1 on the main sorting mechanism 110 and matching with the action of the first vibrating disc 1001; each secondary sorting device considers the confusion during primary sorting and carries out secondary sorting, so that the sorted small iron pieces are purer; the primary sorting device 100 and the secondary sorting device can complete sorting only through simple structural design without other auxiliary equipment; manual sorting can be replaced, the sorting efficiency is greatly improved, and the manpower consumption is reduced; and the risk of injury to the operating personnel during sorting is reduced.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. The utility model provides a full automatization part letter sorting equipment, its characterized in that, includes main sorting device (100), sells piece secondary sorting device (200), K board nut secondary sorting device (300) and tension silk nut secondary sorting device (400), main sorting device (100) includes first vibration dish (1001) and first letter sorting mechanism (110), be equipped with spiral shell screwing in first vibration dish (1001) and export and extend to first conveying passageway (111) of first vibration dish (1001) outside, first letter sorting mechanism (110) are connected the export of first conveying passageway (111), first letter sorting mechanism (110) including letter sorting main channel (1) and along letter sorting main channel (1) set gradually and respectively with sell piece passageway (2), K board nut passageway (3), K board screw passageway (4) that letter sorting main channel (1) is connected, A pin channel (5) and a tension wire nut channel (6); the secondary pin sorting device (200) is located below the pin channel (2), the secondary K plate nut sorting device (300) is located below the K plate nut channel (3), and the secondary tension wire nut sorting device (400) is located below the tension wire nut channel (6).

2. The fully automated parts sorting apparatus according to claim 1, wherein the sorting main channel (1) comprises:

the main track (10) is used for conveying pin pieces (20) to be sorted, K plate nuts (30), K plate screws (40), pins (50) and tension wire nuts (60);

the height limiting side plate (104) is connected to the outer side edge of the head end of the main rail (10) and is provided with a first pin sheet outlet (201) the height of which is limited only by the pin sheet (20) to pass through;

the sub-track (20) is used for screening out the tension wire nuts (60) and conveying the tension wire nuts;

the guide height limiting surrounding rod (105) is used for guiding the K plate screw (40) and the pin (50);

pin piece passageway (2) are connected outside first round pin piece export (201), K board nut passageway (3) are connected direction limit for height pin (105) are close to the outside of limit for height curb plate (104) one end, the head end of branch track (20) is connected on main track (10), end-to-end connection lag wire nut passageway (6), pin passageway (5) are located the end of main track (10), direction limit for height pin (105) are located the top of main track (10) and with there is the interval in the track face of main track (10), the interval size satisfies to be limited only to pass through pin piece (20) and K board nut (30), direction limit for height pin (105) one end is connected limit for height curb plate (104), the other end extend to pin passageway (5) department, main track (10) be in pin passageway (5) with be equipped with between K board nut passageway (3) and make K board (40) drop and fall and the K board nut passageway (3) is equipped with and make The K plate screw channel (4) is located below the K plate screw opening (44), and the tension wire nut channel (6) is located at the other end of the sub-rail (20).

3. The fully automated parts sorting apparatus according to claim 1, wherein the pin secondary sorting device (200) comprises a second vibratory pan (210) and a second sorting mechanism (212), the feed inlet of the second vibrating disk (210) is over against the outlet of the pin sheet channel (2), a second conveying channel (211) which is spirally ascended and the outlet of which extends to the outside of the second vibrating disk (210) is arranged in the second vibrating disk (210), the second sorting mechanism (212) is connected with the outlet of the second conveying channel (211), the second sorting mechanism (212) comprises a curved track (213) for changing the lying transport pins into a vertical transport and a pin counting outlet (214), the pin sheet counting outlet (214) is connected to the tail end of the curved surface track (213), and a first light sensing counter is arranged at the pin sheet counting outlet (214).

4. The full-automatic parts sorting apparatus according to claim 1, wherein the K-plate nut secondary sorting device (300) comprises a third vibratory tray (500) and a third sorting mechanism (502), a feed port of the third vibratory tray (500) faces an outlet of the K-plate nut passage, a third conveying passage (501) which is spirally raised and an outlet of which extends to the outside of the third vibratory tray (500) is provided in the third vibratory tray (500), the third sorting mechanism (502) (502) is connected with an outlet of the third conveying passage (501), the third sorting mechanism (502) is arranged around an outer wall of the third vibratory tray (500), the third sorting mechanism (502) comprises a flow limiting rail (503), a pin screening rail (504) and a K-plate nut independent rail (505) which are sequentially connected along a conveying direction of the third sorting mechanism (502), the current limiting rail (503) is an inner inclined surface inclined inward along the outer side of the third vibration plate (500); the pin sheet screening track (504) is an outer inclined surface which inclines outwards along the inner side of the third vibrating tray (500); a blocking strip (509) is further arranged on the inner side edge of the current limiting rail (503), the height of the blocking strip (509) is 0.8-1.2 times of the thickness of the pin piece (20), the inner side edge of the pin piece screening rail (504) is flush with the inner side edge of the current limiting rail (503), and a height drop exists between the outer side edge of the pin piece screening rail (504) and the outer side edge of the current limiting rail (503); the utility model discloses a pin piece secondary sorting device, including round pin piece screening track (504), round pin piece screening export (507) are located the feed inlet top of round pin piece secondary sorting device (200), the end of the independent track of K board nut (505) is equipped with second light sense counter, and the round pin piece screening track is equipped with side shield (506) on the outside limit of track (504), the side shield (506) are last to have seted up the round pin piece screening export (507).

5. The full-automatic part sorting equipment according to claim 1, wherein the second sorting device (400) comprises a fourth vibratory tray (401) and a fourth sorting mechanism (402), a fourth conveying channel (403) is arranged in the fourth vibratory tray (401) and extends to the outside of the fourth vibratory tray (401), the head end of the fourth sorting mechanism (402) is connected to the tail end (417) of the fourth conveying channel (403), the fourth sorting mechanism (402) comprises a sorting track (404), and the fourth sorting mechanism (402) is sequentially provided with:

a deflection ladder (405) for deflecting the tension wire nut or the combination (408) for horizontal conveying into vertical conveying;

the height limiting rod (406) is used for lifting the combined body (408) with the height exceeding the height H of the single tension wire nut during vertical conveying to enable the combined body to become horizontal conveying;

and the posture screening port (407) is used for enabling the tension wire nuts conveyed in a lying mode to fall back to the inside of the fourth vibration disc (401), and the tension wire nuts conveyed in a standing mode cannot fall.

6. The fully automated parts sorting apparatus according to claim 5, wherein the sorting track (404) is provided with an inner side plate (414) at one side and an outer side plate (415) at the other side near the outer wall of the fourth vibratory pan (401); the attitude screening port (407) comprises a longitudinal notch (418) formed in one end, close to the rail surface, of the inner side plate (414) and a transverse notch (419) formed in one end, close to the inner side plate (414), of the rail surface and extending corresponding to the longitudinal notch (418); the distance E between two mutually opposite edges of the longitudinal notch (418) and the transverse notch (419) is larger than the radial width M of a single tension wire nut, the width B of the longitudinal notch (418) is smaller than the height H of the single tension wire nut, the width C of the transverse notch (419) is smaller than the radial width M of the single tension wire nut, and the lengths L of the longitudinal notch (418) and the transverse notch (419) are equal and are both larger than the height H of the single tension wire nut.

7. The fully automated parts sorting apparatus according to claim 2, wherein the main track (10) comprises a front end track (101), a middle track (102) and a rear end track (103) connected end to end in sequence, the pin plate channel (2) and the K-plate nut channel (3) are connected on the front end track (101), and the width of the middle track (102) is less than 1.5 times the width of the tension wire nut (60); the K plate screw channel (4) and the pin channel (5) are positioned below the rear end track (103); the rear end rail (103) and the sub rail (20) are arranged adjacently and are connected to the same end of the middle rail (102) together, and the distance between the side edge of the rear end rail (103) adjacent to the sub rail (20) and the guide height-limiting surrounding rod (105) is smaller than 1/2 of the width of the tension wire nut (60).

8. The fully automated parts sorting apparatus according to claim 2 or 7, wherein the main track (10) and the sub track (20) are each circular arc-shaped; the main track (10) is continuously downward gradient along the pin sheet channel (2), the K plate nut channel (3), the K plate screw channel (4) and the tension wire nut channel (6).

9. The full-automatic part sorting equipment according to claim 2, wherein the K-plate nut channel (3) comprises a channel bottom plate which is flush with the main rail (10), one side of the channel bottom plate is connected to the main rail (10), the side of the channel bottom plate, which is opposite to the main rail (10), is provided with a side baffle (301), and a second pin outlet (302) is further formed in the side baffle (301), and the second pin outlet is positioned above the pin secondary sorting device (200).

10. The fully automated part sorting apparatus according to claim 2, wherein the guiding height-limiting fence (105) is provided with a notch (41) or an arch portion for dropping a K-plate screw (40) at a corresponding position of the K-plate screw opening (44), the notch (41) or the arch portion is opposite to a first side block (42) of the K-plate screw opening (44) up and down, a second side block (43) opposite to the first side block (42) on the K-plate screw opening (44) is located outside the main rail (10), and a distance D between the first side block (42) and the second side block (43) satisfies: the length of the K plate screw (40) is less than D and less than the length of the pin (50).